83816421 has 8 divisors (see below), whose sum is σ = 120351840. Its totient is φ = 51579312.

The previous prime is 83816419. The next prime is 83816431. The reversal of 83816421 is 12461838.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 83816421 - 2¹ = 83816419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83816401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1074531 + ... + 1074608.

It is an arithmetic number, because the mean of its divisors is an integer number (15043980).

Almost surely, 2^83816421 is an apocalyptic number.

It is an amenable number.

83816421 is a deficient number, since it is larger than the sum of its proper divisors (36535419).

83816421 is a wasteful number, since it uses less digits than its factorization.

83816421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2149155.

The product of its digits is 9216, while the sum is 33.

The square root of 83816421 is about 9155.1308565197. The cubic root of 83816421 is about 437.6326385317.

The spelling of 83816421 in words is "eighty-three million, eight hundred sixteen thousand, four hundred twenty-one".